Subject: Re: [AUDITORY] Loud Speaker and Power Amplifyer Recomendations From: Mikhail Pozdniakov <mike_pdk@xxxxxxxx> Date: Tue, 29 Jun 2021 13:08:49 +0000--_000_DM6PR10MB3498BDDBB34F04083BCBB9ECE5029DM6PR10MB3498namp_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Hi Andrew, The online forum Audio Science Review (https://www.audiosciencereview.com/)= measures and produces anechoic data for speakers, and fairly comprehensive= electrical measurements for power amplifiers and other devices. I administer the database there (see the dropdowns under Review Index). If = you give your budget and more detailed spec requirements there are plenty o= f good recommendations. I disagree with using Rogers or ATC loudspeakers for research. While flat o= n axis, their directivity off axis is not controlled. Mikhail ________________________________ From: AUDITORY - Research in Auditory Perception <AUDITORY@xxxxxxxx>= on behalf of Andrew A Clark <andrew.clark@xxxxxxxx> Sent: June 28, 2021 07:38 To: AUDITORY@xxxxxxxx <AUDITORY@xxxxxxxx> Subject: Loud Speaker and Power Amplifyer Recomendations Dear List I=92m looking for some advice, I=92m trying to spec a passive loud speaker = and an amplifier for running free field EEG experiments - the stimuli are a= ll speech. I would love to get a pair of Rogers LS5/9 that I used in my previous lab, = but alas my budget doesn=92t stretch that far. The problem with trying to = evaluate speakers is that the published data sheets don=92t ever seem to gi= ve a plot of the frequency responses. I was wondering what other people we= re using or what they would recommend? My next conundrum is about power amplifiers. The old Yamaha P series amps = were really great because they had step graduated dB attenuators which made= calibration easy and you didn=92t need to worry about taping down, glueing= or sawing off the volume knob as much. The replacement PX series is digit= al. Is using a digital amplifier a bad idea? I can imagine the repeated q= uantisation would lead to increase in distortion. Again, does anybody have any amplifier recommendations? Many thanks, Andrew Andrew A Clark LiRI Lab Manager University of Zurich Linguistic Research Infrastructure Andreasstrasse 15 CH-8050, Zurich Switzerland Room: AND 2.76 --_000_DM6PR10MB3498BDDBB34F04083BCBB9ECE5029DM6PR10MB3498namp_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable <html> <head> <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DWindows-1= 252"> <style type=3D"text/css" style=3D"display:none;"> P {margin-top:0;margin-bo= ttom:0;} </style> </head> <body dir=3D"ltr"> <div style=3D"font-family:"segoe ui westeuropean","segoe ui&= quot;,helvetica,arial,sans-serif; font-size:12pt; color:rgb(0,0,0)"> Hi Andrew,</div> <div style=3D"font-family:"segoe ui westeuropean","segoe ui&= quot;,helvetica,arial,sans-serif; font-size:12pt; color:rgb(0,0,0)"> <br> </div> <div style=3D"font-family:"segoe ui westeuropean","segoe ui&= quot;,helvetica,arial,sans-serif; font-size:12pt; color:rgb(0,0,0)"> The online forum Audio Science Review (<a href=3D"https://www.audiosciencer= eview.com/">https://www.audiosciencereview.com/</a>) measures and produces = anechoic data for speakers, and fairly comprehensive electrical measurement= s for power amplifiers and other devices.</div> <div style=3D"font-family:"segoe ui westeuropean","segoe ui&= quot;,helvetica,arial,sans-serif; font-size:12pt; color:rgb(0,0,0)"> <br> </div> <div style=3D"font-family:"segoe ui westeuropean","segoe ui&= quot;,helvetica,arial,sans-serif; font-size:12pt; color:rgb(0,0,0)"> I administer the database there (see the dropdowns under Review Index). If = you give your budget and more detailed spec requirements there are plenty o= f good recommendations. </div> <div style=3D"font-family:"segoe ui westeuropean","segoe ui&= quot;,helvetica,arial,sans-serif; font-size:12pt; color:rgb(0,0,0)"> <br> </div> <div style=3D"font-family:"segoe ui westeuropean","segoe ui&= quot;,helvetica,arial,sans-serif; font-size:12pt; color:rgb(0,0,0)"> I disagree with using Rogers or ATC loudspeakers for research. While flat o= n axis, their directivity off axis is not controlled.</div> <div style=3D"font-family:"segoe ui westeuropean","segoe ui&= quot;,helvetica,arial,sans-serif; font-size:12pt; color:rgb(0,0,0)"> <br> </div> <div style=3D"font-family:"segoe ui westeuropean","segoe ui&= quot;,helvetica,arial,sans-serif; font-size:12pt; color:rgb(0,0,0)"> Mikhail</div> <div><br> </div> <hr tabindex=3D"-1" style=3D"display:inline-block; width:98%"> <div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" co= lor=3D"#000000" style=3D"font-size:11pt"><b>From:</b> AUDITORY - Research i= n Auditory Perception <AUDITORY@xxxxxxxx> on behalf of Andrew = A Clark <andrew.clark@xxxxxxxx><br> <b>Sent:</b> June 28, 2021 07:38<br> <b>To:</b> AUDITORY@xxxxxxxx <AUDITORY@xxxxxxxx><br> <b>Subject:</b> Loud Speaker and Power Amplifyer Recomendations</font> <div> </div> </div> <div> <div name=3D"x_messageBodySection"> <div dir=3D"auto">Dear List<br> <br> I=92m looking for some advice, I=92m trying to spec a passive loud speaker = and an amplifier for running free field EEG experiments - the stimuli are a= ll speech.<br> <br> I would love to get a pair of Rogers LS5/9 that I used in my previous lab, = but alas my budget doesn=92t stretch that far. The problem with = trying to evaluate speakers is that the published data sheets don=92t ever = seem to give a plot of the frequency responses. I was wondering what other people were using or what they would recommend?<b= r> <br> My next conundrum is about power amplifiers. The old Yamaha P se= ries amps were really great because they had step graduated dB attenuators = which made calibration easy and you didn=92t need to worry about taping dow= n, glueing or sawing off the volume knob as much. The replacement PX series is digital. Is using= a digital amplifier a bad idea? I can imagine the repeated quan= tisation would lead to increase in distortion. <br> <br> Again, does anybody have any amplifier recommendations?<br> <br> Many thanks,<br> <br> Andrew</div> </div> <div name=3D"x_messageSignatureSection"><br> Andrew A Clark <div dir=3D"auto">LiRI Lab Manager</div> <div dir=3D"auto"><br> </div> <div dir=3D"auto">University of Zurich</div> <div dir=3D"auto">Linguistic Research Infrastructure</div> <div dir=3D"auto">Andreasstrasse 15</div> <div dir=3D"auto">CH-8050, Zurich</div> <div dir=3D"auto">Switzerland</div> <div dir=3D"auto"><br> </div> <div dir=3D"auto"><span style=3D"">Room: AND 2.76</span></div> </div> </div> </body> </html> --_000_DM6PR10MB3498BDDBB34F04083BCBB9ECE5029DM6PR10MB3498namp_--